System Description

Differential Lock System: System Description

The differential lock system consists of the following components

- Differential lock control unit
- Differential lock mode switch
- Differential lock position switch
- Differential lock solenoid
- ABS actuator and electric unit (control unit)
- Transfer control unit

Differential Lock System Operation

When the differential lock mode switch is in the LOCK position, a signal is sent to the differential lock control unit. The differential lock control unit monitors input from the ABS actuator and electric unit (vehicle speed and VDC operation) and the transfer control unit (4WD shift switch). If conditions are set, the differential lock control unit provides power and ground to the differential lock solenoid to lock the differential. The differential lock position switch provides feedback to the differential lock control unit as to whether the lock is engaged based on pressure plate position. The differential lock control unit provides ground to the DIFF LOCK indicator lamp to activate the lamp. Refer to the Owner's Manual for differential lock system operating instructions.

As a fail-safe function, the differential lock disengages when a malfunction is detected in the differential lock system. "DTC check" can be performed using SDT. Refer to [SDT Function (Diff Lock)] Scan Tool Testing and Procedures.

Differential Lock Operation





1 Differential lock solenoid operates pressure plate.
2 Pressure plate presses cam ring.
3 Engage cam ring and side gear, and the differential is locked.

Differential Lock Indicator Lamp Operation





NOTE:

The differential lock standby condition is the time where the differential lock mode switch is in the LOCK position and the differential is unlocked.